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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investment Securities (Detail) - Class of Financing Receivable, Type of Borrower [Domain] - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Municipal Bonds [Member] | PUERTO RICO    
Schedule Of Investments [Line Items]    
Percentage Of Held To Maturity Securities 73.00%  
Debt Securities, Held-to-maturity, Allowance for Credit Loss $ 8,600,000 $ 8,800,000
Municipal Bonds [Member] | PUERTO RICO | Held-to-maturity Securities [Member]    
Schedule Of Investments [Line Items]    
ACL forecast period two  
ACL Reversion Period three  
Residential Mortgage Backed Securities [Member] | US States and Political Subdivisions Debt Securities [Member]    
Schedule Of Investments [Line Items]    
Investment securities available for sale $ 2,900,000 $ 0